JPS5918032A - Safely tilting device for different direction tilting type cargo box for vehicle - Google Patents

Abstract

PURPOSE:To safely carry out the operation of cargo tilting, by enabling an elevating device for tilting a cargo box to be operated only when a pivoting section for tilting the cargo box in an optional direction is surely positioned in its locking condition. CONSTITUTION:A solenoid SOL5 is energized by closing switches S1, S2 to change over a solenoid valve to a position where a pump is communicated with an operating cylinder in a cargo box pivoting section. One of switches S4 through S6 which corresponds to an optional tilting direction is closed to energize the corresponding solenoid valve SOL1 through SOL5 for changing over another selector valve so that the operating cylinder is communicated with and operated by the pump. When the selected pivoting section is completely locked, the corresponding limiting switch LS1 through LS4 is closed to energize a safety device A. Then the operating cylinder is locked by opening the above-mentioned closed switch S4 through S6. Further, when the selector valve is changed over by closing the switch S3 to energize a SOL6, a cargo box operating cylinder is communicated with and operated by the pump.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention allows the cargo box to be tilted in an arbitrarily selected tilting direction among pivot parts of a vehicle cargo box that can be selectively tilted in different directions. This invention relates to a safety tilting device for a cargo box that can tilt in different directions for a vehicle, which is configured so that the lifting device for tilting the cargo box can be operated only when the pivot portion is securely locked. be.

In a vehicle cargo box that can be selectively tilted in different directions, each pivot portion of the cargo box is selectively operated between a locked state and a released state, and when the cargo box is tilted, Only the pivot parts that allow the cargo box to be tilted in an arbitrarily selected tilting direction are held in a locked state, and the other pivot parts are kept in a released state.

By the way, for example, in the case where a cargo box is to be tilted while the vehicle is on uneven ground, the pivot portion for tilting the cargo box in the selected tilting direction is not necessarily in a secure state. However, if the cargo box is tilted while the pivot is in an incompletely locked state, there is a fear that the cargo box may separate from the pivot to which it should be pivoted and suddenly fall.

SUMMARY OF THE INVENTION Therefore, the main object of the present invention is to provide a safety tilting device for a vehicle tilting cargo box in different directions, which prevents the cargo box from being tilted while the pivot portion is in an incompletely locked state. be.

An embodiment of the present invention will be described below with reference to the drawings.

First, in FIGS. 1 to 3, a front cargo box support device 4 and a rear cargo box support device 5 are mounted on a vehicle body frame 3 extending to the rear of a driver's cab 2 of a vehicle 1 having the form of a dump truck, for example. The front cargo box support device 4 is provided with pivot parts 6L16R at both left and right ends for selectively pivoting the cargo box 9, and the rear cargo box support device 5 Pivot supports 7L17R for selectively pivoting the cargo box 9 are provided at both left and right ends of the carrier.

At approximately the center of the cargo box 9, a distal end portion of a cargo box lifting cylinder 8, which constitutes the lifting device of the present invention and whose base end is supported by the vehicle body frame 3 so as to be tiltable in all directions, is located approximately at the center of the cargo box 9. 9 so that it can swing freely in all directions.

Normally, the pair of front and rear pivots 6t, 7t on the left have the same structure, and the pair of front and rear pivots 5 on the right
n and 7R have the same structure, and furthermore, the front pair of pivots 6Lt6R have a mutually symmetrical structure, and the rear pair of pivots 7L and 7R also have a mutually symmetrical structure. Therefore, only the rear left pivot portion 7L will be described in more detail below, especially with reference to FIG.

The left end of the pivot shaft 10, which passes through the rear cargo box support device 5 in the left-right direction and is rotatably supported, has an upwardly open shaft i.
A rotating member 12 having a concave portion 11 having a T-shaped shape is fixed, and within the concave portion 11 of the rotating portion 12,
Bracket 13 protruding from the lower surface of the rear left side of the cargo box 9
The rear left engaging pin 15I7, which is integrally supported by the rear left engaging pin 15I7, can be inserted into the rear left engaging pin 15I7. A rear left engagement hook 17L, which is rotatably operated via a link mechanism 25L, is rotatably supported on the rotary portion 12 around a pivot shaft 19L.

The rear left engagement hook 17L is connected to the rear left engagement pin 15L.
is rotated between a locking position where it is locked in the recessed part 11 and a release position where it is disengaged from the rear left engaging pin 15L and allows the rear left engaging pin 15L to move upward from the recessed part 11. Rear left engagement hook 17L
When the rear left engaging pin 15L is locked,
The cargo box 9 can be tilted to the left using the rear left engagement pin 15L as a rotation axis, and can be tilted rearward using the pivot shaft 10 as a rotation axis.

In particular, in FIG.
The movement of the rod 220 in the longitudinal direction, that is, the movement of the rod 22 in the longitudinal direction, is caused by the link mechanism 24L.
and 25R, respectively, into locking and releasing movements of the front left pivot portion 6L and the rear right pivot portion 7R, and when the actuation cylinder 20 is extended and the rod 22 is moved rearward, the front left engagement The hook 16L is the pivot shaft 18
At the same time, the rear right engaging hook 17R rotates around the pivot shaft 19R and engages the rear right side of the loading box 9 side. pin 15
R is locked, and when the actuating cylinder 20 contracts and moves the rod 22 forward, the front left engagement hook 16I7 rotates around the pivot shaft 18L and engages the cargo box 9 side. The rear right side engagement hook 17R rotates around the pivot shaft 19R together with the front left side engagement pin 14L and separates from the rear right side engagement pin 15rt on the cargo box 9 side.

Further, the movement of the condo 230 in the longitudinal direction driven by the other of the pair of actuation cylinders 20.21, that is, the movement of the rod 23 in the length direction, is carried out via link mechanisms 24R and 25L, respectively. This is converted into a locking and releasing movement of the right side pivot 6R and the rear left side pivot 7L, and when the operating cylinder 21 is extended and the rod 23 is moved rearward, the front right engagement hook 16R moves around the pivot shaft 18R. and detach from the front right side engagement pin 14R on the cargo box 9 side, and the rear left side engagement hook 17
L rotates around the pivot shaft 19t and locks the rear left engagement pin 15L on the cargo box 9 side, and on the other hand, when the operating cylinder 21 contracts and the rod 23 moves forward, The front right side engagement hook 16R rotates around the pivot shaft 18R to lock the front right side engagement pin 14R on the cargo box 9 side, and
The rear left engagement hook 1γL rotates around the pivot shaft 19L and separates from the rear left engagement pin 15L on the cargo box 9 side.

Therefore, when the operating cylinder 20 contracts and the operating cylinder 21 extends, the front and rear left pivots 6
t, 7t are in the locked state, and the front and rear right pivot parts 6R, 7R are in the released state, making it possible for the cargo box 9 to tilt to the left. When both of them are extended, the rear left and right pivot parts γL and 7R are both locked, and the front left and right pivot parts 6L+6n are both released, causing the cargo box 9 to move rearward. It becomes possible to tilt,
Further, when the operating cylinder 20 is extended and the operating cylinder 21 is contracted, the front and rear right pivot parts 6R1
7R is in the locked state, and the front and rear left pivot parts 6t,
7t is in the released state, the cargo box 9 can be tilted to the right.

FIG. 4 shows an example of a hydraulic circuit for telescopically operating each of the operating cylinders 20, 21 and the cylinder 8 for lifting and lowering the cargo box. The hydraulic oil sucked from the oil tank T and discharged by the hydraulic pump 26 is first sent to the switching valve 27. When the switching valve 27 is switched to the left side, the hydraulic oil is sent to the switching valves 28 and 29, and the excess oil at that time is returned to the oil tank T via the check valve 30. In this state, when the switching valve 28 is switched to the left side, the operating cylinder 21 is operated to contract, and when the switching valve 2B is switched to the right side, the operating cylinder 21 is operated to extend. At this time, when the actuating cylinder 21 retracts until the front right pivot 6R is securely locked and the rear left pivot 7L is released, the limit switch LS, which is normally cut off, is energized. On the contrary, when the front right pivot 6R is reliably brought into the released state and the rear left pivot 7L is extended until it is locked, the limit switches r and s, which are normally in the cutoff state, are activated. , makes it energized.

Further, when the switching valve 29 is switched to the right side, the operating cylinder 20 is operated to contract, and when the switching valve 29 is switched to the left side, the operating cylinder 20 is operated to extend.

At this time, the actuating cylinder 20 is securely moved to the front left pivot portion 6.
When L is locked and the rear right pivot 7R is retracted until it is released, the limit switch LS3, which is normally cut off, becomes energized and, on the contrary, the front left pivot is reliably activated. 6-L is released and the rear right II (11 pivot portion 7R is extended until it is locked), the limit switch/
, S4 are energized.

The hydraulic oil discharged from each working cylinder 21, 20 flows back to the oil tank 1' through the respective switching valves 28, 29, and when each switching valve 28, 29 is placed in the middle q position, The hydraulic oil sent to each switching valve 28, 29 returns to the oil tank T as it is.

When the switching valve 27 is switched to the right side, the hydraulic oil discharged from the hydraulic pump 26 is forced through the switching valve 27 to the cylinder 8 for unloading the cargo box, that is, the lifting device of the present invention, and the cylinder 8 for lifting and lowering the cargo box The cylinder 8 for lifting and lowering the cargo box is pushed downward by the weight of the cargo box 9 and contracts t2. At that time, the hydraulic oil discharged from the cylinder 8 for the cargo box E passes through the switching valve 27 to the oil tank. Reflux to T. When the switching valve 27 is placed in the neutral position, the hydraulic oil sent to the switching valve 27 returns to the oil tank T as it is.

FIG. 5 shows an example of a control circuit for controlling the hydraulic circuit shown in FIG. 4. First, power switch S1 is turned on, and then regular switch S2 is turned on.
The solenoid SOt, 5 of the switching valve 27 is energized, and the switching valve 27 is switched to the left side. In this state, when the normally open switch 54 is energized, the solenoid 5QL2 of the switching valve 28 and the solenoid SQL of the switching valve 29 are energized, so that the switching valves 28 and 29 are turned on and off.
t are respectively switched to the right side, and as a result, the working cylinder 2° is operated to contract, while the working cylinder 21 is operated to be extended. Then, the front and rear left pivot parts 6L and 7L are placed in a locked state, while the front and rear right pivot parts 6R.

When 7R is placed in the released state, the limit switch /, S
2 and/or S3 become energized, the safety device A becomes energized.

In this state, when the normally open switch 54, which is in the energized state, is returned to the cutoff state, the solenoid SO/
, 2. When the energization to S O/, 4 is stopped t2, each switching valve 28, 29 returns to the neutral position, and the operating cylinder 20 in the contracted state and the operating cylinder 21 in the extended state are locked in that state. . Then, the common switch S2, which has been placed in the energized state, is returned to the cutoff state, and the -C solenoid SO
/, 5 is demagnetized, the normally open switch S is energized (and the solenoid 5OL6 of the switching valve 21 is energized, the switching valve 27 is switched to the right side, and the pilot lamp P is lit. As a result, the hydraulic oil discharged from the hydraulic pump 26 is sent to the cargo box lifting cylinder 8 via the switching valve 27, and by extending the cargo box lifting cylinder 8, the cargo box 9 is tilted to the left. .

When returning the cargo box 9 that has tilted to the left to the horizontal state, the normally open switch S3 in the energized state is returned to the cutoff state to demagnetize the solenoid 5QL6, and then the normally open switch S2 is energized and the solenoid SQL When , is excited, the switching valve 27 is switched to the left side, and as a result, the cylinder 8 for lifting the cargo box is compressed by the load on the side of the cargo box 9, and the hydraulic oil discharged from the cylinder 8 for lifting the cargo box is , and returns to the oil tank T via the switching valve 27.

When tilting the cargo box 9 backward, first energize the power switch S and the normally open switch S2, energize the solenoid, SQL, and switch the °C switching valve 27 to the left, and then turn the normally open switch S2 on. , put the current in the ℃ frenoid 5
When QL2 and SQL are energized, switching valve 28 is switched to the right and switching valve 29 is switched to the left. As a result, each actuating cylinder 20.21 has an extension actuation (
2, by energizing the limit switches /, S2, /, S, the safety device A becomes energized.

This means that the front left and right pivots 6L and 6R are in a released state, and the rear left and right pivots 7b and 7R are in a secure locked state.

In this state, the normally open switch S5, which is in the energized state, is shut off and the solenoids So/, 2. By demagnetizing SO/, 3, each switching valve 28, 29 is returned to the neutral position and each operating cylinder 20, 21 is locked, and the normally open switch S2 is shut off to demagnetize the solenoids So, , . After returning the switching valve 27 to the neutral position by doing so, when the normally open switch S3 is energized, the pilot lamp P lights up, the solenoid SQL is energized, and the switching valve 27 is switched to the right side. As a result, the oil discharged from the oil pump 26 is sent to the cargo box lifting cylinder 8 via the switching valve 27, and the cargo box lifting cylinder 8 is extended to tilt the cargo box 9 backward. When the cargo box lifting cylinder 8 is locked with the cargo box 9 tilted backward,
When the normally open switch S3 in the energized state is returned to the cutoff state, the solenoid 5QL6 is demagnetized, the switching valve 27 returns to the neutral position, and the cylinder 8 for lifting and lowering the cargo box is locked.

When returning the cargo box 9 that has tilted backward to the horizontal state, the pilot lamp P is off and the solenoid 5 is turned off.
After confirming that QL6 is demagnetized, the normally open switch S2 is energized, the solenoid 5QL5 is energized, and the switching valve 27 is switched to the left side, so that the cargo box lifting cylinder 8 lifts the load on the cargo box 9 side. The hydraulic oil discharged from the cylinder 8 for lifting and lowering the cargo box returns to the oil tank T via the switching valve 27, and the cargo box 9 returns to a horizontal state.

When tilting the cargo box 9 to the right, first energize the power switch S and the normally open switch S2, energize the solenoid SOt and switch the selector valve 27 to the left, and then turn the normally open switch S6 on. When the solenoid SQ L and SOt, 3 are energized and energized, the switching valves 28 and 29 are switched to the left side, the operating cylinder 20 is extended, and the operating cylinder 21 is contracted, so that the front and rear left side When the pivot portions 6L, 7L are held in the released state and the front and rear right pivot portions 5R and 7R are in the locked state, the limit switches /, S, and LS4 are energized.

In this state, the normally open switch S6, which is in the energized state, is shut off and the solenoid 5ol4. ,SOt,.

Demagnetize the switching valves 28, 29, return each switching valve 28, 29 to the neutral position, lock each operating cylinder 20, 21, and shut off the normally open switch S2, solenoid SQL.

After demagnetizing the switching valve 2T and returning the switching valve 2T to the neutral position, when the normally open switch S is energized, the pilot lamp P
lights up, the solenoid 5OL15 is energized, and the switching valve 27 is switched to the right side.
The discharged oil is sent to the box lifting cylinder 8 via the switching valve 27, and the packing box lifting cylinder 8 is extended to tilt the cargo box 9 to the right. If you want to lock the cargo box 9 in this state, return the normally open switch S3, which is in the energized state, to the cutoff state, and the solenoid SQL will be demagnetized and the switching valve 21 will be demagnetized.
returns to the neutral position, and the cylinder 8 for lifting and lowering the cargo box is locked.

When returning the cargo box 9 that has tilted to the right side to the horizontal state, the pilot lamp P is off and the solenoid 5QL6 is activated.
After confirming that the normally open switch S2 is demagnetized,
When energized, the solenoid SQL is energized, and the switching valve 27 is switched to the left side, the cylinder 8 for outside the cargo box is compressed by the load on the cargo box 9 side, and is discharged from the cylinder 8 for lifting/lowering the cargo box. The loaded hydraulic oil flows back to the oil tank T through the switching valve 27, and the cargo box 9 returns to the horizontal state.

In the above embodiment, each IJ mitswitch ts,
, t, s2, Ls3 and LS4 have been described as opening and closing in direct conjunction with the telescopic operation of the pair of actuation cylinders 20.21, but instead of this, each engagement hook 1
In conjunction with the rotational movement of 6L116+1, 17L and 1γR, each limit switch LS, , /, S is controlled via electrical, hydraulic, or mechanical control force transmission means.
2. It is also possible to configure so that /, , view, and t, S4 are operated to open and close.

As described above, according to the present invention, the cargo box is tilted toward the vehicle body by selectively operating so as to tilt the cargo box in different directions relative to the vehicle body.

Since it is equipped with multiple pivot points for tilting, there is a high degree of freedom in setting the tilting direction of the cargo box (it is possible to set it in any two, three, or even more directions that are different from each other). At the same time, the operation control between the locked state and the released state in each pivot portion can be performed by a control device having a simple configuration.

Furthermore, among the pivot parts, the cargo box can be tilted in an arbitrarily selected tilting direction. Since it is equipped with a safety device that enables the operation of the lifting device, it is possible to completely prevent the situation where the cargo box is tilted while the pivot is in an unsafe locked state. Work can be done in 5 rows.

[Brief explanation of drawings]

Figure 1 is a rear view of the dump truck with the cargo box tilted to the left, Figure 2 is an enlarged partial sectional view of the main part of Figure 1, and Figure 3 is a diagram showing the various pivot points for supporting the cargo box. FIG. 4 is a perspective view showing an example of a mechanical part of the locking and releasing operation control device, FIG. 4 is a diagram showing an example of a hydraulic circuit for operating the mechanism shown in FIG. FIG. 5 is a diagram showing an example of a control circuit for controlling the operation of the hydraulic circuit shown in FIG. 4; A...Safety device, 6L, 6R, 7L, 7R...Pivotal part, 8...Cylinder for lifting and lowering the cargo box constituting the lifting device of the present invention, 9...Logging box, 20.21... Book Actuating cylinder constituting the actuating device of the invention Patent applicant: Kyokuto Kaihatsu Kogyo Co., Ltd.

Claims (1)

[Claims] A safety tilting device for a vehicle different direction tilting cargo box (9) that can selectively tilt in different directions, the safety tilting device comprising:
A plurality of pivot parts (61) selectively actuate to lock the cargo box (9) to the vehicle body so that the cargo box (9) can be tilted in each tilting direction with respect to the vehicle body. ,t6
R17Lt7R) and each of the above-mentioned pivot parts (6L, 6R, 7b
, 7u) between a locked state and a released state; and the packing box (9).
a lifting device (8) for tilting the
61, t6Rt7LlγR), when the pivot parts (6L, 7L; 6R17R; γL, γR) that can tilt the cargo box (9) in an arbitrarily selected tilting direction are surely in the IF state. σ), the lifting device (8)
It is equipped with a safety device (, 4) that enables the operation of the
Safety tilting device for cargo boxes that tilt in different directions for vehicles.